Hey Dave long time no see
I hated the regular scrapers they sold at pet store they just didn't do the job scraping glass I put 1 big scratch in my 90g as the blade was just flat , just glad it was on the very side of the front glass ,
I went to home depot and bought a professional glass scraper cost me $45. but worth every penny , the handle is 24 inches long and it holds 3 inch stainless razor blades you can also add a extension if needed
it takes off algae real easy even takes off the Coraline build up replacement blades aren't cheap either but I love this thing , you just need to be careful by all the silicone seals as it will cut right through them
this thing makes my life so much easier cleaning glass , I used to use the cleaner magnets but I couldn't stand the streaks on the glass